Valve mechanism for compound engines.



P. O. POULSON. VALVE MECHANISM FOR COMPOUND ENGINES. APPLIGATION FILED 001'. s, 1909. RENEWED AUG. 26, 1910.

971 A'TWQ. Patented Sept. 27, 1910.

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rm; NORRIS PETERS 20., WASHINGTON, o, c,

I51 E S PATENT OFFICE.

VALVE MECHANISM FOR COMPOUND ENGINES.

To all whom it may concern:

Be it known that I, PAUL OLUFF PoULsoN, a citizen of the United States, and a resident of Brigham city, in the county of Box Elder and State of Utah, have invented a new and Improved Valve Mechanism for Compound Engines, of which the following is a full, clear, and exact description.

This invention relates to certain improvements in compound reciprocating engines, and more particularly to the valve mechanism for controlling the admission and exhaust of the steam or other expansible motive fluid.

This application is a division of my prior application, Serial Number 496,797, filed March 18, 1909.

Reference is to be had to the accompanying drawings, forming a part of this speci- 1 fication, in which similar characters of ref erence indicate corresponding parts in all the figures, and in which Figure 1 is a top plan view of a compound engine constructed as illustrated in my prior application above referred to, the

cylinders being shown in longitudinal section; Fig. 2 is a transverse section through the two cylinders and valve mechanism; and Fig. 3 is a top plan view of the cylinders, the top of the valve case being removed.

In my improved engine I preferably employ two parallel cylinders 10 and 11, the first of which receives the live steam and acts as a high pressure cylinder, while the other takes the exhaust steamv from the first cylinder and operates from secondary expansion. In the high pressure cylinder there are two pistons 12 and 13, and in the low pressure cylinder there are two pistons 12 and 13. These cylinders each move from the center to the end of the cylinder and move simultaneously in opposite directions. The pistons are so connected to the crank shaft 15, that when the two pistons 12 and 13 are approaching each other, the two pistons 12 and 13 are separating or moving toward the opposite ends of the low pressure cylinder. The piston rod construction and the means for connecting these pistons to the crank shaft 15, have not been illustrated in detail, as such construction is preferably identical with that illustrated in my prior application above referred to.

For controlling the admission of motive fluid to the cylinders, I preferably provide Specification of Letters Patent; Patented Sept. 27, 1910.

Original application filed March 18, 1909, Serial No. 496,797.

1909, Serial No. 521,262. Renewed August 26, 1910.

Divided and this application filed October 6,

Serial No. 579,159.

a single steam chest 30, which may extend across the two cylinders and communicate with both. The cylinder 10 is provided with a single port 31, intermediate its ends and communicating with the steam chest, and serving both as an inlet and an exhaust port. The cylinder 11 is provided with two ports 32 and 33, one of which serves as an inlet port and the other of which serves as an exhaust port. YVithin the steam chest is a slide valve 34, having a passage 35 extending longitudinally thereof. \Vith the valve in the position indicated in Fig. 2, this passage 35 in the valve establishes communication between the port 31 of the cylinder 10 and the port 32 of the cylinder 11. At this time partially expanded steam may exhaust from the high pressure cylinder 10 through the passage 35 to the low pressure 11, and operate to spread apart the pistons in the latter. Upon shifting the valve toward the left, the port 31 is uncovered,'so that it communicates directly with the in terior of-the steam chest. Live steam may now enter from a. conduit 36 and fiow through the steam chest and the port 31 to the cylinder 10. A port 37 in the valve will be brought into registry with the port 33, so that the exhaust steam in the low pressure cylinder 11 may escape through an ex haust conduit 33. The slide valve thus controls the admission and exhaust of steam to both of the cylinders and helps to insure the operating of the two cylinders in unison.

For operating the slide valve, a suitable bell crank lever 39 may be employed and pivoted intermediate its ends to a bracket 40 at one end of the steam chest. One end of the bell crank lever may have slot-andpin-connections with a valve rod 41, connected to the slide valve, and the other end of said lever may be connected by a. link 12 to a bracket 13 on the cross head 18 of the low pressure cylinder.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

An engine of the class described, comprising two parallel cylinders, a steam chest common to both of said cylinders, a slide valve within said steam chest and having a passage therethrough, a combined inlet and exhaust port in one of said cylinders and communicating with said passage when said valve is in one position, an inlet port in the other cylinder communicating with said pasname to this specification in the presence of sage When the Valve is 1n the above-menl two subscribing Witnesses. tioned'positlon, and an exhaust port for said last-mentioned cylinder and controlled by PAUL OLUFF POULSON' 5 said valve independently of the passage WVitnesses:

through the latter. ANTHON CHRISTIAN NIELSEN,

In testimony whereof I have signed my I CHRIS FREEZE. 

